<template>
    <div>
        <h1>Two</h1>
        <h2>{{ count }}</h2>
        <button @click="$forceUpdate()">强制更新</button>
        <button @click="changeA">更新a</button>
    </div>
</template>

<script>
var b = 1;
var a = [1];
export default {
    name: "Two",
    data() {
        return {
            count: a,
        };
    },
    methods: {
        changeA() {
            b++;
            a.push(b);
        },
    },
    mounted() {
        console.log("mounted");
    },
    updated() {
        console.log("updated");
    },
};
</script>

<style></style>
